Note An air carrier that is a corporation may be in a combined group for taxable years beginning on or after January 1, 2009. See s. Tax 2.61(2) for a description of corporations required to use combined reporting.
Wis. Admin. Code Department of Revenue Tax 2.46
Note Air carriers that are in combined groups must adjust the numerator and denominator of each of these factors and then convert the arithmetical average of these factors to the modified sales factor. The modified sales factor then determines the company's Wisconsin share of the combined group's apportionable income. See s. 71.255(5), Stats., and s. Tax 2.61(7) for details.
Section Tax 2.46 interpretss. 71.04(8) (c) and 71.25(10) (c), Stats.